单词：Hipparchus
音标：[hi'pa:kəs] ；
n. 希帕克斯（古希腊天文学家）
n. Greek astronomer and mathematician who discovered the precession of the equinoxes and made the first known star chart and is said to have invented trigonometry (second century BC)
词型变化：名词复数形式 : hipparchuss